通过弱酸激活离子通道TRPV3的决定因素
Daniel Rudolf1, Inês C A Pombeiro Stein1, Toni Sturhahn1
1Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, 30625 Hannover, Germany.
International journal of molecular sciences
|September 13, 2025
概括
暂时受体潜在化物3 (TRPV3) 通道被弱酸 (如酸) 激活. Asp512对质子敏感性至关重要,而其他突变改变了通道功能,揭示了TRPV3激活机制的洞察力.
科学领域:
- 分子生物学分子生物学
- 离子通道生理学 离子通道生理学
- 生物化学 生物化学
背景情况:
- 包括TRPV3在内的暂时受体潜在化物 (TRPV) 通道表现出质子敏感性.
- 质子灵敏性的机制在TRPV通道之间有所不同,对TRPV3.3的理解有限.
- 之前的研究表明,通过细胞酸性酸化激活TRPV3的三种细胞内动机.
研究的目的:
- 为了研究暗示的细胞内动机在弱酸激活TRPV3中的作用.
- 为了确定参与质子传感和TRPV3通道活性调制的特定残留物.
- 探索弱酸如何增强TRPV3对热和卡瓦克罗尔等其他刺激的反应.
主要方法:
- 在HEK 293T细胞中暂时表达的野生型 (WT) 和突变的人类TRPV3.
- 全细胞补丁电生理学测量膜电流.
- 在不同的pH值和度下应用弱酸 (酸,酸,碳酸) 和其他激活剂 (卡瓦克罗尔,热).
主要成果:
- TRPV3-WT通道在pH值为5.0时显示由酸 (HOAc),酸和碳酸激活.
- HOAc诱导的激活是度依赖的和pH敏感的,并强化了卡瓦克罗尔和热反应.
- 突变TRPV3-Asp512Ala失去了HOAc的敏感性,而Gln689/Asp727的突变增强了HOAc和热敏性.
- 2-APB结合部位 (His426) 的突变没有显著影响HOAc敏感性.
- 在TRPV3中引入TRPV2基结合部位 (Glu216His) 增加了HOAc的敏感性.
结论:
- 事实上,TRPV3通道被几个弱酸激活和敏感化.
- Asp512被确定为TRPV3.3.的质子调节的关键细胞内部位.
- 需要进行进一步的结构研究,以充分阐明TRPV3.3的质子灵敏机制.
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